CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 59,484	$ 5,926
Accounts receivable, net	299,367	304,900
Accounts receivable from affiliates	13,386	9,421
Investments in utility money pool arrangement	50,000	0
Accrued unbilled revenues	222,160	297,078
Inventories	205,640	202,220
Regulatory assets	81,021	103,783
Derivative instruments	3,681	10,934
Prepayments and other	24,193	34,559
Total current assets	958,932	968,821
Property, plant and equipment, net	13,550,488	12,849,799
Other assets
Regulatory assets	972,876	958,429
Derivative instruments	861	3,398
Other	27,636	25,637
Total other assets	1,001,373	987,464
Total assets	15,510,793	14,806,084
Current liabilities
Current portion of long-term debt	305,437	5,270
Short-term debt	0	129,000
Accounts payable	399,402	376,186
Accounts payable to affiliates	32,179	98,797
Regulatory liabilities	61,224	101,110
Taxes accrued	138,924	171,862
Accrued interest	33,430	48,619
Dividends payable to parent	88,588	74,208
Derivative instruments	6,049	6,788
Other	79,265	73,022
Total current liabilities	1,144,498	1,084,862
Deferred credits and other liabilities
Deferred income taxes	3,122,909	2,889,129
Deferred investment tax credits	28,559	30,661
Regulatory liabilities	493,674	512,933
Asset retirement obligations	298,740	289,563
Derivative instruments	4,255	7,828
Customer Advances for Construction	159,012	162,742
Pension and employee benefit obligations	269,156	285,774
Other	59,909	62,201
Total deferred credits and other liabilities	4,436,214	4,240,831
Commitments and contingencies
Capitalization
Long-term debt	4,303,229	4,210,936
Common stock — 100 shares authorized at $0.01 par value; 100 shares outstanding at Sept. 30, 2017 and Dec. 31, 2016, respectively	0	0
Additional paid in capital	3,851,318	3,633,216
Retained earnings	1,797,778	1,659,239
Accumulated other comprehensive loss	(22,244)	(23,000)
Total common stockholder’s equity	5,626,852	5,269,455
Total liabilities and equity	$ 15,510,793	$ 14,806,084